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To make up a solution of phosphate buffered saline (PBS), you need 5mM Na2HPO4 (anhydrous) (FW: 141.96), 0.15 M NaCl (FW: 58.44), and 1 mM KH2PO4 (FW: 136.09). How many grams of each will you need to make up 500mL of PBS?
A 70.0 g steam sample at 150.0 degree Celsius was converted to ice at -150.0 degree Celsius, calculate the total amount of heat removed in the process.
What is the "mass per volume" percent sodium hypochlorite content of your household bleach product?
For the aqueous reaction 2Cr3+ + 3IO4- +10OH- = 2CrO42- + 3IO3- + 5H2O, under a given set of conditions, the rate of appearance of CrO42- is 3.0 x 10-4 mol/L•s. What is the rate of disappearance of IO4-
Determine the pH at the point in which the acetate ion concetration equals the acetic acid concentration. (that is where the acetic acid is 50% ionized)
the equilibrium constant, Kc for the reaction: Ni(s) + 4CO(g)>-- Ni(s) + 4CO(g)
What is the percent change in the volume of a balloon if the air inside it is cooled from 67C to 47C?
Determine all equilibrium concentrations, the pH, the pOH and the percent ionization of each of the following acids in water.
A 28.7 g sample of ethylene glycol, a car radiator coolant, loses 676 J of heat. What was the initial temperature of ethylene glycol if the final temperature is 32.5°C (c of ethylene glycol = 2.42 J/gK)? =°C
10.0 mL sample of aqueous HCL requires 32.34 mL of 0.108 M NaOH to reach the endpoint. What is the molar concentration of HCL. the equation for reaction is NaOH+HCl ..... NaCl + H2O
suppose you have a calorimeter that contains 100.0 grams of water at an initial temperature of 25 c. a salt 2.19 g
what is the energy of light that is emittted by one iron atom during its decay from an excited state to a ground state
a certain substance has a molar enthalpy of vaporization of 31.6 kjmol. how much of the substance is in a sample that
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